Motor connection indicator



June 26, 1928.

I H. W. BEAVER MOTOR CONNECTION INDICATOR Filed July 11, 1925 IJV'VENTOR. HENRY W. BEA v52.

V W/W Q.

Patented June 26, 1928.

UNITEDSTATES HENRY w. BEAVER, or nos ANGELES, cALIronNrA.

Moron CONNECTION INDICATOR.

Application filed July 11, 1925. Serial No. 42,992.

My invention relates to and has for its purpose the provisionof an extremely simple and inexpensive device which can be easily manipulated to indicate and thus quickly determine the changes in the coils or windings of a polyphase induction motor necessary to render the motor operative to current having a voltage greateror less than that for which the coil connections were origlnally des1gned. My lnvent on 1s par-' ticularly adapted, although not necessarily, for use in connection with three phase motors, where the windings of the motor are connected for current of 220 or 4A0 volts,

forexample, and it is desired to reconnect the windings for 4 10 or 1220 volts.

Heretofore considerable skill and time has been required to reconnect the motor windings for a'diiferent voltage, but by means of my indicatorthe new connections can be determined instantly, thus permitting the reconnecting operation to be performed with facility and dispatch.-

In the accompanying drawings,

Figures 1 and 2 are views showing, respectively, the obverse and reverse side of one form of indicator embodying my in vention; r

Figure'3 is a central vertical sectional view of the indicator shown in Figures 1 and-2.

Referring specifically to the drawings, in which similar'reference characters refer to similar parts in each of the several views, my invention, in its present embodiment, comprises a central and relatively large disk 15 to the periphery of which is secured a yoke 15 by which the entire device may be secured to watch chain or the like to facilitate carrying and prevent loss thereof- At opposite sides of'the disk 15 are intermediate disks but less than the diameter of the disk 15, so that the marginal edges at both sides of the disk 15 will at all times be exposed. At the outer sides of the disks 16 and 17 relatively small disks 18 and 19 are arranged to expose the major outer sides of the disks 16- and 17, and the disks 16 to 19 inclusive are permanently associated with and rotatable independently of ,each other and the disk 15 on a headed pin or rivet 20 extending axially through all of the disks. t

On the obverse side of the disk 15 (Figure 1) are two scales N and, N, consisting of numbers representing, respectively, the numbered free ends of the group winding leads 16 and 17 ofv the same diameter,

ofthe short method of connection for-four pole and six pole three phase induction motors. A, On the outer side of the disk 16 are two groups of lines L and L, representing, re-

spectively, one-circuit and two-circuit group windlng connections, the disk being rotab ableto permit use of either circuit connection with either scaleN or N.

On the outer side'of the small disk 18 are three groupsof lines K, K, K represent mg, respectively, the star point and the two forms of delta phase connections and the motor leads in each instance to the external. source of current. As the disk 18 is capable of rotation, it will be clear that any. one of the three connections can be brought into, reading relationto. either the one-circuit or two-circuit diagram. A i c On the reverse side of the disk 17 V (Figure 2) are two scalesN and N representing, respectivel the numbered free ends of the group winc ing leads of the long and uniform methods of connections for both four and, six pole three phrase induction motors. The outer sideof th'edisk 17 is. provided with two groups of lines L? and L diagram matically representing, respectively, onenections, and as the disk is rotatablev either circuit and two-circuit group windingconcircuit connection can be. used with either scale N? or N. vTheouter side of thefdisk- 191s provided with the same groups of lines K,K and K representing the same three forms ofphaseconnectionsas described in connection Withthe disk 18, i a In using the indicator, it is first necessary to examine the winding, connections of three phasemotorand determine which of the three methods of group connecting, namely, short, long or uniform, has been em ployed. I have adopted the terms short, long and uniform to -designate three well known methods of group connecting which may be defined as follows: The short method involves the connecting of groups of coils in. a one to four sequence; the long method, in acne to seven sequence; and tlieuni form a modification of the long, which consists in connecting the groups of coils in a one to sevensequence except that the second Subsequent to determining the method of connection, the coil group leads arenum bered, respectively, from one to twelve, and 1 preferably in a counter-clockwise directlon.

The leads so numbered are identified on the indicator by the scales N, N, etc., but it will be noted that the order of the numbers of the scales is not consecutive for the purpose of permitting the use of both the one and two circuit diagrams with either scale.

To illustrate one method of using the indicator, let it be assumed that it is desired to reconnect a three phase induction motor from 220 to 440 volts. Upon examining the group connections, it is found that the uniform method has been used. As the motor is wound for tour poles, reference is now made to the scale N reading the numbers thereof with seven and eight transposed in both instances, so that seven follows five and eight follows six. For asix or more pole motor, the numbers seven and ei ht are read in the order in which they are shown in the scale, or just the reverse to the order above described.

By tracing the group connections of the motor, it is found that the phase lead 2 is connected to 10and llto 8. Now, by rotatin the disk 17, the two circuit diagram L is rought into roper relation to scale N as illustrated in igure 2. It is now found that the numbers 1 and 10, and 11 and 8 are connected, respectively, to each other, but

no connection exists between the two pairs.

The disk 19 is now rotated until the proper connection, which in the present instance is the delta connection K, is brought into registering relation, to the two-circuit diagram L The delta connection K serves to connect all four leads 1, 10, 11 and 8 together, so that it is now known that the pres ent connection of the motor is a two-circuit delta. Having determined the existing connection is a two-circuit delta, it'is known to those skilled in the art thatto operate such a motor on 440 volts, it will benecessary to reconnect the motor to a one-circuit delta. This can be efl'ected by rotatingthe disk 17 so as to bring the one-circuit diagram L into registering relation with the scale N and the diagram K and subsequently reconnecting the group winding connections of the motor in accordance with the changes indicated on the diagrams L and K In a similar manner, the indicator can be employed to definitely determine the original the invention and the spirit and scope of the appended claims.

I claim as my invention:

1. An indicator of the character described 2. An indicator of the character described" comprising a rotatable element having thereon series of symbols with each series diesig? nating a series of-motor phaseleads, a second rotatable element havlng thereon groups of lines with each group designating a motor circuit, a third rotatable element having thereon groups of lines with each group designatin a method of phase connection, and means or associating the three elements to permit independent rotation of each and in a manner to allow anydesired motor circuit designation to be brought into registering relation to any series of motor phase leads designated and any desired method of'phase connection designation into registering relation to any, motor circuit designation.

An indicator as embodied in claim 2 wherein the; three elements are in the form of disks of different diameters and mounted for rotation about a common axis.

4. An. indicator of the character described comprising a plural-it of. relatively movable members. one of said members having inscribed thereon a plurality-of different sets of scales designating a corresponding number of different motor group-winding leads, another of said members having inscribed on the same a plurality of difl'erent circuitwinding connections, and the other of said members having inscribed on the same a plurality of different sets of phase connections and motor leads greater innumber than the sets of motor roup winding leads, and scales on thetwo first mentioned members, said membersbeing adapted to be moved into a plurality of positions to bring any one set of phase connections and motor leads into registry with any one of the sets of the circuit winding connections, and any one of the circuit winding connections into registry with any one of the sets of scales .desigof various types of electrical circuits, the circuit portions of one of said members being adapted to be moved into registry with the circuit portions of the other of said members to indicate the proper connections necessary to partially complete a particular circuit, and scales on still another of said members to designate the leads of each circuit necessary to be connected in'practice to complete a selected circuit.

6. An indicator of the class described comprising a plurality of relatively movable members, certain of said members having inscribed on the same inter-related portions of various types of electrical and motor windings, the Winding portions of one of said members being adapted to be moved into registry with the Winding'portions of the other of said members to indicate the proper connections necessary to partially complete each particular Winding. and scales on still another of said members to designate the leads of each Winding necessary to be connected in practice to complete a selected Winding.

7. An indicator of the class described comprising a plurality of relatively movable members arranged in superimposed position 7 and in a manner to expose portions of the same complementary to each other, certain of said members having inscribed on the exposed portions thereot inter-related portions of various types of electrical generator and motor Windings,the Winding portions of partially complete each particular Winding,

and scales on still another of said members sary to be connected in practice to complete a selected Winding.

' HENRY BEAVER.

40 to designate the leads of each Winding neces- 

